Multi-Band Wake-Up Radio Signaling With Lower PAPR

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Solution Overview

Problem

Current wireless local area network (WLAN) technologies face challenges in efficiently managing wake-up signals across multiple channels, leading to significant fluctuations in the time domain and high Peak-to-Average Power Ratio (PAPR), which affects the power consumption and coverage of wake-up radios (WURs).

Innovation Solution

The implementation of a method that aligns Inverse Discrete Fourier Transform (IDFT) durations for low and high data rate OOK signals, introduces phase rotations for each wake-up radio band, and utilizes Golay-based multi-band OOK waveforms to control signal fluctuations, ensuring aligned symbol boundaries and reduced PAPR across channels.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If wake-up signals are transmitted across multiple channels with different data rates, then the coverage and accessibility of wake-up radios are improved, but significant fluctuations in the time domain and high PAPR occur, affecting power consumption

Engineering Contradiction:

Improvemulti-channel wake-up signal transmissionVSAvoidpower consumption

Core Design Contradiction:

Adaptability or versatilityVSUse of energy by moving object

Solution Approach 1:

The patent applies parameter changes by adjusting phase rotations for each wake-up radio band and aligning IDFT durations for low and high data rate OOK signals. These parameter adjustments control signal fluctuations and reduce PAPR, thereby lowering power consumption while maintaining multi-channel transmission capability

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent employs periodic action through aligned symbol boundaries across different channels. By synchronizing the periodic structure of wake-up signals and using repeated modulated legacy signal fields, the system manages multi-channel transmissions with controlled power characteristics

Inventive Principle:

Principle #19Periodic action

2Adaptability or versatility

Engineering Contradiction:

Improvemulti-channel wake-up signal transmissionVSAvoidsignal fluctuations

Core Design Contradiction:

Adaptability or versatilityVSObject-affected harmful factors

Solution Approach 1:

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent uses composite signaling approaches by combining low and high data rate OOK signals across multiple channels with coordinated phase rotations. This composite signal structure achieves both wide coverage and controlled fluctuations through the synergistic combination of different signal types

Inventive Principle:

Principle #40Composite materials

3Device complexity

If Inverse Discrete Fourier Transform durations are not aligned for low and high data rate OOK signals, then signal transmission simplicity is maintained, but symbol boundaries are misaligned causing increased PAPR

Engineering Contradiction:

Improvesignal processing complexityVSAvoidPAPR

Core Design Contradiction:

Device complexityVSPower

Solution Approach 1:

The patent aligns IDFT durations for low and high data rate OOK signals by adjusting processing parameters. This alignment maintains relatively simple signal processing while reducing PAPR through coordinated transformation durations across different data rate channels

Inventive Principle:

Principle #35Parameter changes

4Device complexity

If phase rotations are not applied for each wake-up radio band, then transmission simplicity is maintained, but signal fluctuations increase leading to higher power consumption

Engineering Contradiction:

Improvetransmission processing complexityVSAvoidpower consumption

Core Design Contradiction:

Device complexityVSUse of energy by moving object

Solution Approach 1:

The patent applies phase rotations for each wake-up radio band by adjusting phase parameters in the signal processing chain. This relatively simple parameter adjustment effectively controls signal fluctuations and reduces power consumption across multi-band operations

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS12063596B2Methods for frequency division multiplexed on-off keying signals for wake-up radios

Publication Date: 2024.08.13 INTERDIGITAL PATENT HOLDINGS INC

AI summary

An access point (AP) that supports the IEEE 802.11ba protocol may transmit a frame including a physical layer (PHY) preamble to one or more stations (STAs) over a channel. The PHY preamble may include a plurality of repeated modulated legacy signal (L-SIG) fields to spoof a recipient of the frame and protect a wake up signal (WUS) to be subsequently transmitted by the AP. The AP may transmit the WUS to at least a first STA of the one or more STAs, wherein the at least the first STA is a IEEE 802.11ba compliant STA.